Dangerous heat, heavy wildfire smoke march across North America
A treacherous one-two punch of heat and fire, aggravated by the burning of oil and gas, scorched a large swath of North America on Thursday, killing at least 15 people in the United States in recent days, sickening countless others, closing schools and testing basic services that remain unprepared for the new perils of summer.
Source: bostonglobe.com
